Organismal continuant entity which is enclosed by the bona fide boundary of an organism or is an attribute of its structural organization. Examples: cell, heart, head, peritoneal cavity, apex of lung, anatomical term, sagittal plane. [FMA]

ID

http://www.radlex.org/RID/#RID3

Definition

Organismal continuant entity which is enclosed by the bona fide boundary of an organism or is an attribute of its structural organization. Examples: cell, heart, head, peritoneal cavity, apex of lung, anatomical term, sagittal plane. [FMA]